This self centering drill bitsetis made of premium material, which can withstand long-lasting use. the steel material, which has durability, not to deform. Fine workmanship, ensures practicality. This self centering drill bit setwill make door hingeeasier and smoother. -Color:Assorted Color-Material:Steel-Size:11.00X2.30X2.30cm/4.32X0.90X0.90in- The positioning is convenient and will not move, and the wood chips will be discharged from the holes on both sides of the drill bit, and the drill bit will not be stuck.- When opening the hole, please adjust it according to the hardness of the wood.- If the wood is soft, you can choose a smaller size. If the wood is hard, you can choose the corresponding or larger size.- Unique design and perfect punching effect, for door hinge .- to use and install, quick changing bits for one-handed load and release. list: 1 x 5/64 inch drill bit1 x 7/64 inch drill bit2 x 9/64 inch drill bits1 x 11/64 inch drill bit1 x 5 inch drill bit1 x 13/64 drill bit1 x 1/4 drill bit1 x wrench